linux: obey move.rects_valid in WebPluginGeometry
linux: obey move.rects_valid in WebPluginGeometry

When move.rects_valid is false, we shouldn't look at the rects included
in the structure.

I am pretty sure the previous code was incorrect, but I am not sure why this
started mattering.  I know that plugins stopped displaying, but when I found
the regression window and reverted the change that first caused it, the problem
still happened.  It seems probable that another change that occurred while this
was regressed broke it further.

BUG=32965

Review URL: http://codereview.chromium.org/549149

git-svn-id: http://src.chromium.org/svn/trunk/src@37033 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: bb3467699fda62f1ce5c33ea2b82af675cc4160c
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser